Add LICENSE and upstream attribution/modification notices

LICENSE

@@ -0,0 +1,194 @@
+Upstream Copyright & Attribution Notice
+=======================================
+- Original Model: NVIDIA NeMo `stt_en_conformer_ctc_small`
+  Copyright (c) 2020-2024, NVIDIA CORPORATION & Affiliates. All rights reserved.
+  Source: https://catalog.ngc.nvidia.com/orgs/nvidia/teams/nemo/models/stt_en_conformer_ctc_small
+- ONNX Export: `csukuangfj/sherpa-onnx-nemo-ctc-en-conformer-small`
+  Copyright (c) Xiaomi Corporation and sherpa-onnx contributors.
+  Source: https://huggingface.co/csukuangfj/sherpa-onnx-nemo-ctc-en-conformer-small
+
+Modification Notice (Apache License 2.0, Section 4(b))
+======================================================
+Copyright (C) 2026, Ambarella International LLC.
+Modified from the upstream ONNX export for execution on Ambarella CVflow v3
+N1-655 (`vdg_arch = 0xB`) Neural Vector Processor (NVP):
+1. Fixed dynamic input shape to static `[1, 80, 1024]` IEEE FP16.
+2. Quantized and compiled graph via Ambarella Cooper SDK CNNGen 3.9.0
+   (`cavalry_gen 3.0.4`) into `n1-655_conformer_ctc_small_amba_optimized.bin`.
+
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README.md

@@ -5,11 +5,22 @@ license: apache-2.0
 
 # Conformer-CTC Small (Ambarella N1-655 CVflow v3 NVP)
 
+Conformer-CTC Small is a convolution-augmented Transformer speech recognition model trained with Connectionist Temporal Classification (CTC) loss for English automatic speech recognition (ASR).
+
+Original paper: [Conformer: Convolution-augmented Transformer for Speech Recognition](https://arxiv.org/abs/2005.08100)
+
 Model Configuration:
-- Upstream source: [https://huggingface.co/csukuangfj/sherpa-onnx-nemo-ctc-en-conformer-small](https://huggingface.co/csukuangfj/sherpa-onnx-nemo-ctc-en-conformer-small)
+- Reference implementation: [https://github.com/NVIDIA/NeMo](https://github.com/NVIDIA/NeMo)
+- Original Weight: [https://huggingface.co/csukuangfj/sherpa-onnx-nemo-ctc-en-conformer-small](https://huggingface.co/csukuangfj/sherpa-onnx-nemo-ctc-en-conformer-small)
+- Dataset: NeMo ASRSet (LibriSpeech, Fisher, Switchboard, WSJ, NSC, Mozilla Common Voice)
+- License: Apache-2.0 (`LICENSE`)
 - Support Cooper version:
   - CNNGen: `[3.9.0 / n1-655x]` (`cavalry_gen 3.0.4`)
 
+## Upstream Attribution & Modification Notice
+- **Upstream Copyright**: Copyright (c) NVIDIA CORPORATION & Affiliates (NVIDIA NeMo `stt_en_conformer_ctc_small`) and Copyright (c) Xiaomi Corporation / `sherpa-onnx` contributors (`csukuangfj/sherpa-onnx-nemo-ctc-en-conformer-small`), licensed under the Apache License, Version 2.0.
+- **Modification Notice (Apache-2.0 Section 4(b))**: Modified by Ambarella International LLC (2026). Fixed dynamic time dimension to static `[1, 80, 1024]` (10.24 s window), quantized to mixed FP16/INT8 via Ambarella CNNGen (`onnx_surgery` -> `vas` -> `cavalry_gen 3.0.4`), and compiled to CVflow v3 N1-655 (`vdg_arch = 0xB`) Cavalry DAG binary format (`n1-655_conformer_ctc_small_amba_optimized.bin`).
+
 ## NVP Port & Runtime Specification
 - **Target SoC**: Ambarella N1-655 (`vdg_arch = 0xB`, CVflow v3 `cavalry_gen` 3.0.4)
 - **Input port**: `audio_signal` `[1, 80, 1024]` IEEE FP16 (16 kHz PCM -> 80-bin Kaldi log-Mel, 25 ms Povey window, 10 ms hop, per-feature mean/std normalized)